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GPT-6 Cyber vs Grok-4 Heavy

GPT-6 Cyber and Grok-4 Heavy are closely matched at 41.0 and 40.1 on the LLM Stats Score.

OpenAI · xAI · Updated for 2026

Which is better?

GPT-6 Cyber and Grok-4 Heavy are closely matched on the overall LLM Stats Score at 41.0 and 40.1.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose GPT-6 Cyber

  • your work emphasizes coding — it leads those capability indexes

Choose Grok-4 Heavy

  • you are already invested in the xAI ecosystem

At a glance

The differences that matter most.

GPT-6 Cyber
OpenAI
Grok-4 Heavy
xAI
Core performance indexes
LLM Stats Score
41.0
#79
40.1
#82
Coding
33.5
#46
17.6
#147
Cost, coverage & limits
Benchmark wins
—
—
Input price
$20.00 / M
— / M
Output price
$100.00 / M
— / M
Context window
1,050,000
—

Individual benchmarks

1 reported for GPT-6 Cyber · 6 for Grok-4 Heavy

No common benchmarks found

GPT-6 Cyber and Grok-4 Heavydon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only GPT-6 Cyber specifies input context (1,050,000 tokens). Only GPT-6 Cyber specifies output context (128,000 tokens).

OpenAI
GPT-6 Cyber
Input1,050,000 tokens
Output128,000 tokens
xAI
Grok-4 Heavy
Input- tokens
Output- tokens
Wed Nov 11 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both GPT-6 Cyber and Grok-4 Heavy support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

GPT-6 Cyber

Text
Images
Audio
Video

Grok-4 Heavy

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

GPT-6 Cyber

Proprietary

Closed source

Grok-4 Heavy

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-6 Cyber was released on 2026-11-05, while Grok-4 Heavy's release date is not specified.

We can confirm GPT-6 Cyber's release timeline, but cannot make a direct age comparison without Grok-4 Heavy's release date.

GPT-6 Cyber

Nov 5, 2026

5 days ago

Grok-4 Heavy

—

Knowledge Cutoff

When training data ends

Grok-4 Heavy has a documented knowledge cutoff of 2024-12-31, while GPT-6 Cyber's cutoff date is not specified.

We can confirm Grok-4 Heavy's training data extends to 2024-12-31, but cannot make a direct comparison without GPT-6 Cyber's cutoff date.

GPT-6 Cyber

—

Grok-4 Heavy

Dec 2024

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against GPT-6 Cyber and Grok-4 Heavy side-by-side, then vote on the output you prefer.

GPT-6 Cyber
✓ Preferred
Grok-4 Heavy
Open in Playground

FAQ

Common questions about GPT-6 Cyber vs Grok-4 Heavy.

Which is better, GPT-6 Cyber or Grok-4 Heavy?

GPT-6 Cyber and Grok-4 Heavy are closely matched on the LLM Stats Score at 41.0 and 40.1. GPT-6 Cyber is made by OpenAI and Grok-4 Heavy is made by xAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does GPT-6 Cyber compare to Grok-4 Heavy in benchmarks?

GPT-6 Cyber scores ExploitGym: 48.5%. Grok-4 Heavy scores AIME 2025: 100.0%, HMMT25: 96.7%, GPQA: 88.4%, LiveCodeBench: 79.4%, USAMO25: 61.9%.

What are the context window sizes for GPT-6 Cyber and Grok-4 Heavy?

GPT-6 Cyber supports 1.1M tokens and Grok-4 Heavy supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-6 Cyber and Grok-4 Heavy?

Key differences include LLM Stats Score (41.0 vs 40.1). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-6 Cyber and Grok-4 Heavy?

GPT-6 Cyber is developed by OpenAI and Grok-4 Heavy is developed by xAI.

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